/*
 * Copyright 2014 Francois Karman
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

using System.Collections.Specialized;
using System.Configuration;

namespace Quartz.WebManager.Service
{
    /// <summary>
    /// Configuration for the Quartz server.
    /// </summary>
    /// <remarks>
    /// This code is based on Quartz.Server - a component of Quartz.
    /// </remarks>
    public class Configuration
    {
        private const string PrefixServerConfiguration = "quartz.server";
        private const string KeyServiceName = PrefixServerConfiguration + ".serviceName";
        private const string KeyServiceDisplayName = PrefixServerConfiguration + ".serviceDisplayName";
        private const string KeyServiceDescription = PrefixServerConfiguration + ".serviceDescription";
        private const string KeyServerImplementationType = PrefixServerConfiguration + ".type";

        private const string DefaultServiceName = "QuartzServer";
        private const string DefaultServiceDisplayName = "Quartz Server";
        private const string DefaultServiceDescription = "Quartz Job Scheduling Server";
        private static readonly string DefaultServerImplementationType = typeof(QuartzServer).AssemblyQualifiedName;

        private static readonly NameValueCollection configuration;

        /// <summary>
        /// Initializes the <see cref="Configuration"/> class.
        /// </summary>
        static Configuration()
        {
            configuration = (NameValueCollection)ConfigurationManager.GetSection("quartz");
        }

        /// <summary>
        /// Gets the name of the service.
        /// </summary>
        /// <value>The name of the service.</value>
        public static string ServiceName
        {
            get { return GetConfigurationOrDefault(KeyServiceName, DefaultServiceName); }
        }

        /// <summary>
        /// Gets the display name of the service.
        /// </summary>
        /// <value>The display name of the service.</value>
        public static string ServiceDisplayName
        {
            get { return GetConfigurationOrDefault(KeyServiceDisplayName, DefaultServiceDisplayName); }
        }

        /// <summary>
        /// Gets the service description.
        /// </summary>
        /// <value>The service description.</value>
        public static string ServiceDescription
        {
            get { return GetConfigurationOrDefault(KeyServiceDescription, DefaultServiceDescription); }
        }

        /// <summary>
        /// Gets the type name of the server implementation.
        /// </summary>
        /// <value>The type of the server implementation.</value>
        public static string ServerImplementationType
        {
            get { return GetConfigurationOrDefault(KeyServerImplementationType, DefaultServerImplementationType); }
        }

        /// <summary>
        /// Returns configuration value with given key. If configuration
        /// for the does not exists, return the default value.
        /// </summary>
        /// <param name="configurationKey">Key to read configuration with.</param>
        /// <param name="defaultValue">Default value to return if configuration is not found</param>
        /// <returns>The configuration value.</returns>
        private static string GetConfigurationOrDefault(string configurationKey, string defaultValue)
        {
            string retValue = null;
            if (configuration != null)
            {
                retValue = configuration[configurationKey];
            }

            if (retValue == null || retValue.Trim().Length == 0)
            {
                retValue = defaultValue;
            }
            return retValue;
        }
    }
}
